<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1,.box2, .box3 {
            width: 100px;
            height: 100px;
        }
        .box1 {
            background-color: rgb(89, 243, 42);
        }
        .box2 {
            background-color: rgb(21, 91, 242);
        }
        .box3 {
            background-color: rgb(233, 98, 98);
        }
    </style>
</head>
<body>

    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
</body>
</html>